* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Arial', 'Microsoft YaHei', sans-serif;
    background-color: #f5f5f5;
    line-height: 1.6;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding: 20px 0;
}

.header h1 {
    font-size: 2.5rem;
    color: #4CAF50;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.1);
}

.header p {
    font-size: 1.2rem;
    color: #666;
}

.app-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.app-card {
    background: white;
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
    position: relative;
    overflow: hidden;
}

.app-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4CAF50, #2196F3);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.app-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
}

.app-card:hover::before {
    transform: scaleX(1);
}

.app-card h3 {
    font-size: 1.5rem;
    color: #333;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.app-card p {
    color: #666;
    font-size: 1rem;
    line-height: 1.6;
    margin-bottom: 20px;
}

.app-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, #4CAF50, #2196F3);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
}

.app-link {
    color: #2196F3;
    text-decoration: none;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 5px;
    transition: color 0.3s ease;
}

.app-link:hover {
    color: #1976D2;
}

@media (max-width: 768px) {
    .container {
        padding: 15px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    .app-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .app-card {
        padding: 20px;
    }
}

.loading {
    text-align: center;
    padding: 40px;
    color: #666;
}

.error {
    background: #ffebee;
    color: #c62828;
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
}